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鲸鱼为什么这么大

Why Are Whales So Big?

本期节目由 Rachael Ray 猫粮赞助播出。
This episode is sponsored by Rachael Ray nutrish natural food for cats.

大家好 我是艾米丽 现在是新闻时间
Hi guys I’m Emily! And this is Emily’s News.
为什么有些海洋生物那么大
Why are some marine mammals so big?
上图的抹香鲸和逆戟鲸是几乎最大的动物了
Sperm whales and orcas top the charts with some of the biggest animals around.
但最大的要数蓝鲸 其体重可达到190吨
But the true giant is the blue whale. Weighing up to 190 tons, blue whales
是曾经称霸地球的恐龙体型的两倍大
are two times the size of the biggest dinosaurs that once roamed the earth.
换句话来说 蓝鲸不仅仅是最大的活着的动物
In other words they’re not only thebiggest living animal,
而且是有史以来最大的动物
but the largest that ever existed. That is crazy.
科幻片常让我们认为
Sci fi movies lead us to believe that animals this large are
这么大型的动物会毁坏船只 肆虐四方的
people-eating beasts that destroy boats and wreak havoc.
但这并非事实
But that can be farther from the truth. In fact a blue whale
事实上,蓝鲸甚至不能吞下金枪鱼,更不用说是人类了
can never even swallow a tuna, let alone a human. Despite
尽管他们有巨大的嘴但食道是如此地窄
their enormous mouth and their esophagus is are so small
以至于一片面包都能把它噎着
that they would choke on a loaf of bread.
这种演变而来的特性 一方面限制了蓝鲸的体型
This adaptation however is partially the bank for the blue whale side.
它们的食谱包括小型虾类和浮游生物
Their diet consists of tiny little crustaceans called curl and plankton.
现在 你能想象我们看到成吨的蓝鲸依然健康
Now as you can imagine we’ll see tons of energy stay healthy.
我的意思是 它们的心脏有小汽车那么大
I mean they literally have a heart thesize of a small car.
那为什么他们会选择吃一些很小的生物
So why did they choose some of thesmallest animals to eat?
他们依靠着肺部进食的方法
Blue whales rely on a technique called lunge feeding
他们张开他们的大嘴将这些小虾吸入
for they wisper these poul of fish with their mouths wide open.
这样数量级的超级大嘴一口
Since equivalent absolutely huge groups one mouthful can go down over
就能吃下接近五十万卡路里能量
a thousand curl adding up to nearly five hundred thousand calories,
如果我们想的话这绝对会让我们任何一个人死翘翘
that would most certainly kill us humans if we try to do that.
想象一下坐着喝1000杯奶昔 这听起来像是致命的美味
Imagine drinking 1000 milkshakes in the sitting. That sounds dangerously delicious.
但这并不能满足它这样庞大的体型
But even that is not enough to satisfy such huge animal.
他们一般每天吃8000磅的磷虾和浮游生物
On average they need to eat about 8,000 pounds of krill and plankton a day.
问题是鲸同时吞下大量的水
The trouble is that whales also null of gallons and gallons of water.
他们不需要 为了排出这些水分
they don’t need. To get rid of it, blue whales filter the water out
他们用鲸须将水过滤出去 只剩下食物在里面
using teeth like structures called baleen, which leaves only the curl behind,
因为它们需要不断不断地重复这一个动作
because we also want to constantly repeat this process all day long.
因此它们已经演化出相应的结构
They’ve been adapt these large mouse
拥有大嘴的同时还尽可能保留食物有道理
to get the most nutrition as possible at one time. Makes sense.
看到大嘴你就能猜到它庞大的身躯
With big mouth comes you guessed it a big bodies. And because
因为它们吃得又快又多 因此生长速度也很快
they eat so much so fast they grow much more quickly than other man
别的海洋生物呢 它们不吃磷虾
So what about other marine animals? They don’t only eat krill.
生长在水中就足以让大体型成为可能
Living in the water simply makes growing to a huge size possible.
想象一下你在池子里 浮起来了对吧
Think about when you get in the pool. you float, right?
那是因为水的浮力支撑着你的身体
That’s because the buoyancy of the water support your weight.
甚至是轮胎都比我们巨大 也能够浮起来
Even the wheels are away bigger than us, in the same principle applies.
与陆生动物不同 海洋生物生存空间大得太多
Unlike land mammals marine animals have tons of room in their environment.
它们可以在别个的上面或者下面
They can flow underneath and on top of one another,
因为它们不需要与重力抗衡
because they’re not fighting against gravity.
它们有无限多的空间能够活动
Since they essentially have an unlimited amount of room to move around,
因此海洋生物能比其他物种体型更大
marine animals can grow huge above edges of other species.
当人类会嘲笑别人是大个子时
While humans may mock others for being on the larger side,
鲸鱼会觉得体型大是一件很棒的事
wales know that being big can sometimes be awesome.
不仅是因为这会让捕食者望而却步
Not only does it make them moreintimidating to predators,
并且这也为促进智力增长的大型脑袋提供支撑
but it also promotes increase intelligence because they can support a larger brain.
我猜鲸鱼可以长得无限大
I suppose wales themselves could grow indefinitely,
但是主要器官如肺 肾却不能一旦他们达到一定体型
but important organs such as lungs and kidneys can’t. Once they reach a certain size,
它们的器官对比体型还是那么小
these organs are so small in comparison to the total body size,
这根本无法支撑生命活动
they simply stopped working correctly.
还有什么大型动物更可爱的
What’s more animal would be even cuter for a ginormous. So let me know
在下面评论中告诉我们 记得看这些视频还有订阅我们哟
in the comments down below. Be sure to check out these other videos and subscribe.
回头每天都会有很多动物新闻哟 拜
Come back every day for more animals news. Bye.
感谢 Rachael Ray 猫粮的赞助
Thanks to get the Rachael Ray nutrish for sponsoring this episode.

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